Incandescent-electric-lamp socket.



No. 794.458. PTENTED JULY 11, 1905..

1 L. C. GOLLATZ.

INCANDESCENT ELECTRIC LAMP SOCKET.

l MPL10 ATION EILED 1330.14, 1904.

UNITED STATES Patented July 11, 1905.

PATENT OFFICE.

LOUIS C. GOLLATZ, OE PROVIDENCE, RHODE ISLAND, ASSIGNOR TO PROVIDENCE CAS BURNER Co., OF PROVIDENCE, RHODE ISLAND.

INANDESCENT-ELETFlI-C-LAMP SCCKET.

y SPECIFICATION forming part of Letters Patent No. 794,458, dated July 11, 1905.- i Application iiled December 14, 1904. Serial No. 236,845.

Tn all when?, it may concern:

Be it known that I, LOUIS C. GOLLATZ, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful' Improvement in Incandescent-Electric- Lamp Sockets, of which the following is a specification.

v This invention has reference to an improvement in incandescent-electric-lamp sockets, and more particularly to an improvement in adapters for incandescent-lamp sockets, whereby an obsolete form of socket is made adaptable to a modern form of lamp-base.

'In an obsolete form of socket having a screw-threaded central stem the lamp-hase having a screw-threaded central hole was secured to the socket by screwing the lam p-base onto the stem of the socket. This form of lamp-base has been discarded. The present form of lamp-base consists of a screw-threaded shell having a capof insulating material in the center of which is a metal contact-plate. Adapters as heretofore constructed consisted of a screw-threaded shell adapted to receive the base of a modern lamp and having an insulated end in the center of which is a screw-threaded'sleeve adapted to screw onto the stem of he obsolete form of socket, thus adapting th K obsolete form of socket to the modern lamp. In practice it lhas been found thatthe friction of these adapters on the lampbase is greater thanthe friction on the stem of the socket, causing the adapters to unscrew @rom the sockets when a broken lamp is reri'a'pved from the socket and when not noticed would be .thrown away with the broken lamp or would cause considerable trouble and annoyance to the user inremoving the adapter from the lamp and securing it to the socket again. l

The object of Iny invention is to permanently secure an adapter to an obsolete form offffincandescen t-electric-lamp socket.

My invention consistsV in the peculiar and novel construction of an adapter for securing a modern form of incandescent electriclamp `to an obsolete form of Socket, whereby the adapter is permanently secured to the socket and the lamp can be easily removed from the adapter without the liability of removing the adapter from the socket, as will be more fully set forth hereinafter. i

Figure 1 is a side view of an obsolete form of incandescent-electric-lamp socket broken away to show the screw-threaded central stem, an adapter, and the base end of a modern form of incandescent electric lamp in broken lines, showing the adapter in the position for entering the socket and lthe base end of the lamp in the position for entering the adapter. Fig. 2 is an enlarged transverse sectional view through the adapter, taken on line X of Fig. 1. Fig. 3 is a vertical sectional view through the adapter, taken on line YY of.

Fig. 2. Fig. 4 is an end view of the shell of the adapter Fig. 5 is a face view of the insulating-washer of the adapter. Fig. 6 is a face view of the porcelain insulating end of the adapter, showing the means forv permanently securing the adapter to the socket; and Fig. 7 is a sectional view of the porcelain end of the adapter, taken on line ZZ of Fig. 6. In the drawings, aindicatesan obsolete form of incandescent-electric-lamp socket; b, my improved vsocket-adapter, and c a modern form of incandescent electric lamp. (Shown in broken lines in Fig. l.)

The Socket a has the central screw-threaded stem a for securing an obsolete form of lamp to the socket. This stem a forms one connection and an insulated ring (not shown) surrounding the stem in the socket forms the other connection.

My improved adapter I) consists of a screwthreaded shell b', Surrounded by the tubular piece of insulating material d and adapted to receive the base of a modern lamp c and havl ing a contracted end b2, with the inwardlyturned circular lip b, an insulating-washer b5, a porcelain end b", having the central hole 67, the off-center square cavity bs, forming the sidewall b and merging into the semicircular cavity 61, an internal screw-threaded sleeve adapted to screw onto the stem a' of the socketv and having the head 612, the cut-away portion forming the lip b, a locking-plate b, shaped to approximately lit the cavity b spring bs.

llO

and `having the V-shaped notch b, on one side of which are the teeth b", and a bowsleeve b, as shown in Fig. 6. The bow-y spring b is now `placed in the semicircular cavity b1 in a position for the ends of the spring to hold in the ends of the cavity and the center of the spring to bear on the locking-plate 515, as shown in Fig. 6. v The porcelain end b is now placed in the contracted end b2 ofthe shell, with the washer b intermediate the Ylip b3. and the locking-plate in the porcelain end and secured by spinning the beading b* around and under the porcelain end,

as shown in Fig. 3. f

In the/operation of securing the adapter b to the socket a by screwing the adapter onto the stema the adapter is turned to the right, as shown by the arrow in full lines in Fig. 2. The stem a', passing through the V-shaped notch b1 in the locking-plate :and the sleeve b, moves the locking-plate into the semicircular cavity b1 against the tension of the spring b. As the adapter is screwed to the right to its limit the stem a acts on the teeth b of the locking-plate to force the lockingplate into the semicircular cavity 51 against the tension of the spring b. A reverse movement of the adapter or turning the adapter to the left, as shown by the arrow in broken lines in Fig. 2, would force the locking-plate b against the side wall b of the cavity be and the teeth b on the locking-plate into the stern a', thus preventing the unscrewing of the adapter and permanently securing the adapter to the socket. v

The modern form of lamp c has the screwthreaded shell c', the porcelain ,cap c, and the 'cap forming the base' of the lamp, as shown in broken lines in Fig. 1. The sleeve b of the adapter engaging with the stem a' .of the socket forms one connection and the lip b3 of the adapter engagingwith the ring(not shown) in the socket a forms the other connection for the adapter. 'Ihe contact-plate es on the base of the lamp c engaging with the sleeve b of the adapter forms one connection and the screw-threaded shell c' of the lamp-base screw- I contact-plate c, secured in the center of the l ing into the shell b of the adapter forms the other connection for the la'mp.

' Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. An adapter for electric-lamp sockets having a sc rew-thre'aded shell. a -screw-th readed central sleeve for engaging thecentral stem of -a Thomson-Houston socket, a locking-plate having teeth, and means for moving said locking-plate bodily to engage withthe stem., as' described.

-2. The combination'with an electric-light socket having a screw-threaded stern, of an adapter b consisting-of a screw-threaded shell b' surrounded by insulating material d and having the contracted end b2, the lip b and the beading b4, an insulating-Washer b5, a vporcelain end b having the central hole b", the square cavity be forming the side wall b and merging into the semicircular cavity b1", a screw-threaded sleeve b having the head bm, the cut-away portion bm forming the lip b, a locking-plate b shaped to approximately fit the cavity bs and having the V-shaped notch b1 on one side of which are the teeth buand a bow-spring b1", as described.

In testimony whereof I have signed my name to this specification i'n the presence of two sub'-y scribing witnesses.

' LOUIS C.(JrOI.LA.TZ.`

-Witnesses: A

ADA E. HAGERTY, J. A. MILLER, Jr. l 

